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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '140fde0a9bac249edaab6ef73812ba79188bc300d09f535b26e260afb6be51b1' 
  AND token = 'VnQPTpeQ4Ww0D1+m7+TbeTi+qQ5q5QsD5TAZt266G6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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