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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d2c6515bcd6420a1d824813847c5926302222ba5be0fac622e319e7365733af' 
  AND token = 'FhImgk5Rzl6QF0qMM+NNmEiJLLxnCS0bUE2zRdRl1zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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