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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c19b16d67b24de457d94862b4fc71b3d335411d1fddb821e3033f5188a9a29ea' 
  AND token = 'mD66UWgrb0pgPM8ZcQkFCWyW1haYqpqUYkfRajWk4hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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