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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5da91181419a4776367135b6e949609d9e08fb7f300d588e0c4eb25dffe72ebc' 
  AND token = '42o45HdJahYrM9GASogl4RBwHfTEO1dMtxenRvjt4oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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