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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb930a73e198870b68f9c101203dfe4e984a2ffe774d92dff39d64a767a16a2d' 
  AND token = '9jWsMVcVRI7QuT1OrFb9MRRTm/d858eqprwzKTe7Tvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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