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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e5dfb7590ed3f111618ff5ea40432301641bc97be8190bf0a7f47a67b567876' 
  AND token = 'pmLL7MF1TzHkgS46Fj5kXH7xzB1J5UnFxMUxQh7hmmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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