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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0148a95e19e74760c405aefe4b5ed1cd1e8be1fc63991f33874f5efe8491dd9' 
  AND token = '9kILC8kl1fNX9RYmqmLK+0tC7jXmFtDP9fq7pFMHey0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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