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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f063a1b16016f9760c013f0c0d85237054564d0863c09bb5f5f4e01368e081b8' 
  AND token = 'X60T40my50esEv6Ft1HGRB4J5OeHqQy+qTU+tZWn6pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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