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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a61392d497357181b2d3e564c50d1a6349a4297ffbeaeada83661dc4476f3f5' 
  AND token = 'Q6C5RudQqRWEJ/G1o1W2mTzzLDl3Hdtxkl+Z1TNtnnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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