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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0a1d5e2b4657e06431de0379cf6ba09be816c39fd5317ce6e65b938c9914cc1' 
  AND token = 'g+5KWz01dM6SsJZkjTj+UWMsf5DAr/BfSd9wig8ckRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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