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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc182b386c3c4ed4f78d7a2ef547fe86690053382803bbccee4ff53809d8c1ae' 
  AND token = '0GIOMqChbg1nE29fH86XO/Q8D8REPyrBRrbzFt5fBvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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