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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32147c8c283d1b1dd13ff8a9dedb7e2f36fd8aacc2105512f0b8eea15a499460' 
  AND token = 'EKLEPtqrgipS9zkpsqSTyq/iN0P8nAvaSNZWuIGn4J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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