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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ca66082a1586cdce457b50be4e6dd47d1ef3c1fe047037c629d3fba76d10fa7' 
  AND token = 'mQwfDXY1uId351olgd4j41lCr79falfCJnqdhdpcEiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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