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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af3b3adef072bd1427dd83afc888ffa6ea6dfd775a15feff166706c5649efa2f' 
  AND token = 'zwUu8pCG39P88+LkerL5eecc69H0w5CBPzUKYCFGGIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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