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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afd6bee3bca3fd66acd23a32c877a4f1d7a901e3e91fe8384b60bbde3bc26533' 
  AND token = 'pZFcZ7vH1248e8BFpYj4fgcAHuI3QbLnifazvr9j7L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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