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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9edd17849677ca97824ce9f10f958d5cc2a5b49a2583b26ecb9aa5c42dec0eab' 
  AND token = 'Ihluo2xFEdT5Dz6AIgYy81iJ3h8AYhr7+fb42vnt0jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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