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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd23588b0cb51f2692fee5a6b7c28a37933fb3244cdf0e54f629eb58a7cdac930' 
  AND token = 'rYayZDFlBfrUT+kMJDqOaRMbXWEg5MBOa6MZZ2HlbNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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