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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5c5c8181bdc38e400a2b1fcfe88de095488cd4f9d8933bf833aeba85a90a37b' 
  AND token = 'Lr32foSbk94luj5NqWqj52HCXNCNEvmmHTZ6OCgWahg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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