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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d7641e18281f5bb111796836b0f8257c0e3cd4cd25f2d9b94a0346ce200ddeb' 
  AND token = '8E1CFU+tyUBZyLdlzIs0xW8NiDm8EjtWlRS/VXud6b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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