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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7cd675b24bce82858c792289f99711477d7b24518535c35bec4ef27e87cbbdb3' 
  AND token = 'teQE56sV2moEZ68V3Q3QP8yBQ1Op6JdX7d4ESaeZ9P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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