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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '497075dafed92ab63ebdd9aa8300f666c77be70e9023e499d3be48cf934e7814' 
  AND token = 'i77dGjnScv2m5EJMq10+Kp6EXJFX5k9XosNnWieSSUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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