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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b099c6d460a0aa57910e41dd57ca01e6a573fce2d73775be59b4c84d254852a9' 
  AND token = 'vK4lGM59beCeyIyRJDIRxryrmGiz5JvDqFcNpAyk6rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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