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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd29d0250ff7207f641e985cd5e324c0b75dc344bfd611f7f49240a83167c1e6b' 
  AND token = '+eonD4oAuEBAHC7nKPSRE/yfNug3btQVVE6W1n2KIHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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