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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6b90c42a2a570ba0ec934e8f933f4cc9467334906689f50f79cd0f38585bd39' 
  AND token = 'cXAed/MEsvahiXqBzSIe9WuQk3m26YAtLFE3I0KLBBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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