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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b1aa7b086cd4ac79c74922a52039bd6ad0415d442de38d9060e23d0eff11f0c' 
  AND token = 'KInDyo4CijZOT/0lTkYUr88d12IuXiTwaUppDdbKBSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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