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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d14e7f38c92ca2e59857b6040574c91638fad69c4529e4457bfebe024466b40' 
  AND token = '4X7QIY6avQjHjevtCzsgsUB6rRTIja+2EPRf6i04lIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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