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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'caf9f7a4bd2620877c0bb0e051f07aeb17b94e2ca85a7e231bd4fd50e8659363' 
  AND token = 'fTtjf+cm1zJppQGX6e22xfKPkD2w5cQD/Vm4KCHNKM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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