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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1bc00e58b140ff241e8794b6c5329aafa03b2084e520b28bf6c83f0b0a96627' 
  AND token = 'smdwDeUgZf+BrLRbTbFud7xrtulpPg+j1kr4jM6SMYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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