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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76b067d56ead2e834778eaf6fad74f9b2be915d5fc46db13abe576c6d6d3a707' 
  AND token = 'd8vlDeOdCEJD50DN6yWYSB30YNA5OqgBEnzBhv81ako=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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