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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30ce8483443f7b2a7826d2c3ce74845e3991f5d3a11db25221806ddced851837' 
  AND token = 'bR3oSnr6WxJI7DTku/HSnayTdaBr4MTxw4NCK1p8vU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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