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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9361b3b2851e9d7152b47511e92e7cf2166f2fc5924c4bc5a824f1a42b74b31' 
  AND token = 'MVKyPBQ60dwOZBKEdHj8HdXieGz72j71IwVoA87iS6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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