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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0a8f9a50b60deb4ce9467893ba8c994a7c8cc55afa6cec0125481febcdba45d' 
  AND token = 'KG/HU1QFTM+FTxYHxSkI5DImYrTezMEUSnkCAISyYUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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