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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2523579f045c145febdaa690fcf763db164cb4d955f6ea513a55227d0c58f280' 
  AND token = 'f2sZKMhi53ThildqTZ2cPvbimKAvYKH+V7oLCs9Li9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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