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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee31038e37b66e9f762d16c42cc8a0fdef5f0312b59fb3b05d69ea5ce536e733' 
  AND token = 'UW8B8+qiag6bD6hp3b29Q0Ti+go4/MUZa+o84xBR2ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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