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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'daba2ee5c3c7e8a8bf3fef43cd885a35a345f01f796581d7d31635aa5e42a2a5' 
  AND token = '5a7IIHiIKIdBzzOJV6ia9kMUZA6fv/o/QW7rp5ijuEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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