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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '395a5565ba964f9c4a063b985b1c2803982f3b026cb3eca16ff55db72fd7fd6e' 
  AND token = 'PPc4iYwRbb+SaAl17N3NT5t7oI379g/TarJ/sSTJdiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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