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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1459ce3a52e4f2897bbafadce44c973f77be84a89f06dd50ec5c5dcbae0e0220' 
  AND token = 'guK3RmbSPOhVn6fwgTh1i8g7m12FfleqA0jlwVVqIDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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