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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27adcc8b1dc2b502c9ae8006aa64bce2309121b1af1131d24e2e9371c7de9b90' 
  AND token = 'T8ERnkBsMh+Z+94EBslC0j1fUfXXKzn08P6QBriaIhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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