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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '553e5998929db3ae838c49bedb8739553f74577be1fa686f3d39536c3414424b' 
  AND token = '24RVOKQspPFLKhi8W+dN1mcSCkxF7jg8ZR2T29gLTSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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