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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a73bbae7cbee6bc52d55fe2cb320c3921e6c2a0e10919e78a202d8312588eaf6' 
  AND token = 'FfOYiFwJ0Skr16A4FN+twCYKAsWt4A2UU4uJQ1wJJRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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