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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe40722e01bc0a16f1d1222763f6e9d4269403bbfc7a8f8547e3d90b129b3bcb' 
  AND token = 'eknvZvVh6lepnHPGTfrJCrbsMT07S/dS7JKOPHATAkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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