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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de6b208ea36362ef9b0943ee1db171d42b32480cf3b51c70166ce79403ab4b39' 
  AND token = 'kvaBVTQ+aQJdIez+0Tf/cDZ6sGpuR7ZNI1GWOBrk/1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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