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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11bdfed76fb83439c8485d7f556ed0895db67f9a6b5d5574987a1e7d982330c3' 
  AND token = '5tUPv0NmoLxTJUcbXc+u6wtDtHanCcfwtSLWIMmeS0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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