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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aed482d50eaf3565b04b138ca44b4753db2a683cf8bdba2fca2e1bfa3d4200f6' 
  AND token = '3aR8VsPfX8JL+o5CxSNvT8IBxW2lbMHHoBK2Vi9Kn9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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