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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96c1521262630386f1eb2d2664babc6889b7d7d4742ac69ce4f42c4ef92e0335' 
  AND token = 'UdW7KOyYUwykPP9XKevarG5ECcnga7meGU7Qry9kX5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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