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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf8836570c3ba49b5bc27f3d749b87c3ecb0fedf9f21cb7d3989335b10fcf192' 
  AND token = '/w5GG+QDvMN3tJC8BU6xEflRegMZE1UCtH8uIsWsn0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}