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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b05ae17f827af25f708c2ffbde0901407c931cb5ed6169ace37862ed61c38c73' 
  AND token = 'FAC/brsDReiOJfdu0AiUyRL8aOOM/eXW2Sym/JYQT54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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