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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2233fe9155693160739a26abc8be5d8bb9d83ad0ac914509737d77e78d72b31' 
  AND token = '6dl7NXC4mcCANzSGjsMn44otqIJIPy41Ani2fABdK6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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