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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0da5723b2fe9f692c2b0b4b2573daaa9ece5f7788286d1601a43b50a153a1f3' 
  AND token = 'AOHa8R9nqUar/JHKF3Y+3WAT8KlBztr9lTk2xC/nhOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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