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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cec04c5279eb96bbdd91c21740e42d82038dfd1ff4f3f0da4fcb16cad538ccf9' 
  AND token = 'zUPA5nzQO6XN7xaCqslI66bSYVJ71nVNDLcbZ+i1U3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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