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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18e0d4d3e0a7c0473bc95bf6d28aba82c39ce6634d8e1d7be9e80778d28b8fff' 
  AND token = 'FJYlQtwbamo2NhScdeS9rrV2uP1zbmjWunFcTRrMOj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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