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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2b6ed503959a950a93d2f9dd927fff13702c1eedef7b3ded1f1279330b73fed' 
  AND token = 'L5VqiqxavlWtlcLgdyn2K5lxV1qn2vEsPgKnOJNSoak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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