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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9b5096aca6ab87e9d2c8cac9cd67c8c10d7466bebccee947fb3937b212c5562' 
  AND token = 'zDLB7ZBzr668W6gNJqBGAjVUjnts76MlaakGIdbRv2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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