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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ddce702ac960030e58ffbb80083237d4d16deced18bf6828ebab7ee4cdaa9820' 
  AND token = '6e+ul8ce/mBg0EmtzevxyOO82No/J8wpJ/ql7AoAXRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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