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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aed4a5c71a81941d4264ef6d96596a753c4aa2e4319df4728414fc100384c532' 
  AND token = '9MACyiykn0/UO9JnskCsDqaTq9XD3xN0jglCfhjvptQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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