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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5c8f1b3a451401b88f28f4cf4c98ea4ca74b102828d02fcbaff247aef5d4efc' 
  AND token = 'xuJtg+FhC0NZ0uEXbA2AMMtEHL/lud0BMfjidCrVMNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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