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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ad5a5d89453101b4cf3269ce3cf3501cd81b1675ee50036b38c069d45d49267' 
  AND token = 'xe7Gf3y/bQ0yBAL3Ty+0YJRoRIj/XqnJUezS3yrK2/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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